US Bridges

State Route 142 over Carbon Canyon

Good

San Bernardino County, California · 08-SBD-142-0.18 · Structure no. 54 0100

Built
1928
97 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
33 ft
1 main span
Daily traffic
13,600
2020 count
Owner
State
State Highway Agency

About this bridge

State Route 142 over Carbon Canyon is a steel stringer/multi-beam or girder carrying State Route 142 over Carbon Canyon in San Bernardino County, California. It was built in 1928, so it is 97 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,600 vehicles a day, roughly 1% of them trucks, projected to reach 20,403 by 2041. The structure is 33 ft (10.1 m) long and 28 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

Open in Google Maps
CarriesState Route 142
CrossesCarbon Canyon
Location08-SBD-142-0.18
RouteState Highway 142
CountySan Bernardino County
StateCalifornia
Coordinates33.94703, -117.77972
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating47.8 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length33 ft (10.1 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,600 (2020)
Projected traffic20,403 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed12.4 mi (20 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 142 over Carbon Canyon built?

It was built in 1928, making it 97 years old in 2025.

What condition is State Route 142 over Carbon Canyon in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does State Route 142 over Carbon Canyon carry?

About 13,600 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is State Route 142 over Carbon Canyon?

The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns State Route 142 over Carbon Canyon?

It is owned by the State Highway Agency.